" A teacher has showed to his students a sheet of paper in the middle of which was a black dot, and he asked:- What do you see?- A dot, said the first student.- A black spot, said the second one.- A thick black point, said the third one.

After the teacher listened carefully, he spoke:- All of you have seen a dot, but nobody notice a big white sheet of paper. This is the way we judge people: looking at their minor imperfections! "